Drum dryer

Abstract

A drum dryer provided with a liquid splash and scatter preventing equipment, which enables continuous operation by preventing a scattering liquid from making dry powder in the case in which the equipment is provided above a neighborhood of a liquid concentration section. A double drum type drum dryer including a liquid splash and scatter preventing equipment is provided in a horizontal above a neighborhood of a liquid concentration section between drums and has a cooling function.

1. A double drum type drum dryer comprising:
 two liquid drying drums in a chamber located adjacent one another to form a liquid concentration section therebetween, said liquid concentration section configured to maintain liquid fed into said liquid concentration section in contact with both of the two liquid drying drums; 
 a liquid feed port configured to feed a liquid into the liquid concentration section; and 
 a liquid splash and scatter preventing equipment having a cooling function provided in a location above a portion of the liquid concentration section. 
 
   
   
     2. The drum dryer according to  claim 1 , wherein the liquid splash and scatter preventing equipment having the cooling function comprises therein a cavity for feeding of a cooling liquid refrigerant. 
   
   
     3. The drum dryer according to  claim 1 , wherein the liquid splash and scatter preventing equipment having the cooling function is made of a hollow metal passage for feeding of cooling water. 
   
   
     4. The drum dryer according to  claim 3 , wherein the cooling water maintains a surface temperature of the hollow metal passage at 13° C. to 40° C. 
   
   
     5. The drum dryer according to  claim 4 , wherein the cooling water maintains a surface temperature of the hollow metal passage at 18° C. to 38° C. 
   
   
     6. The drum dryer according to  claim 3 , wherein the cooling water maintains a surface temperature of the hollow metal passage at no more than 5° C. lower than an evaporation temperature of a liquid to be dried. 
   
   
     7. The drum dryer according to  claim 3 , wherein the cooling water maintains a surface temperature of the hollow metal passage at no more than 22° C. higher than an evaporation temperature of a liquid to be dried. 
   
   
     8. The drum dryer according to  claim 3 , wherein the hollow metal passage has an axis parallel to the axis of rotation of the drums. 
   
   
     9. A double drum type drum dryer comprising:
 a liquid splash and scatter preventing equipment having a cooling function provided in a location above a portion of a liquid concentration section between drums, the liquid splash and scatter preventing equipment including a hollow metal passage for feeding of cooling water; and 
 a cooling water feed system configured to supply cooling water to the hollow metal passage such that the cooling water maintains a surface temperature of the hollow metal passage at 13° C. to 40° C. 
 
   
   
     10. The drum dryer according to  claim 9 , wherein the cooling water maintains a surface temperature of the hollow metal passage at 18° C. to 38° C. 
   
   
     11. The drum dryer according to  claim 9 , wherein the cooling water maintains a surface temperature of the hollow metal passage at no more than 5° C. lower than an evaporation temperature of a liquid to be dried. 
   
   
     12. The drum dryer according to  claim 9 , wherein the cooling water maintains a surface temperature of the hollow metal passage at no more than 22° C. higher than an evaporation temperature of a liquid to be dried. 
   
   
     13. The drum dryer according to  claim 9 , wherein the hollow metal passage has an axis parallel to the axis of rotation of the drums. 
   
   
     14. A double drum type drum dryer comprising:
 a liquid splash and scatter preventing equipment having a cooling function provided in a location above a portion of a liquid concentration section between drums, the liquid splash and scatter preventing equipment including a hollow metal passage for feeding of cooling water; and 
 a cooling water feed system configured to supply cooling water to the hollow metal passage such that the cooling water maintains a surface temperature of the hollow metal passage at no more than 5° C. lower than an evaporation temperature of a liquid to be dried. 
 
   
   
     15. The drum dryer according to  claim 14  ,wherein the cooling water maintains a surface temperature of the hollow metal passage at 18° C. to 38° C. 
   
   
     16. The drum dryer according to  claim 15 , wherein the cooling water maintains a surface temperature of the hollow metal passage at no more than 22° C. higher than an evaporation temperature of a liquid to be dried. 
   
   
     17. The drum dryer according to  claim 14 , wherein the hollow metal passage has an axis parallel to the axis of rotation of the drums.